Sour, rotten, or ammonia-like smell
Slimy or sticky texture
Gray, green, or dull discoloration
Mold growth
Package is swollen, leaking, or damaged
Meat feels tacky or unusually wet
Off, rancid, or unusual odor after opening
Expired use-by or sell-by date
Surface is dry and crusty with bad odor
Color changes that do not return after airing briefly
Visible gas bubbles or bloating in packaging
Meat has been left at room temperature too long
Cooked meat tastes sour, bitter, or off
Any sign of spoilage if you are unsure